2.5.3Interrupt assignments

Standard Interrupt assignments

IRQ

Priority

Standard function

0

1

System Timer

1

2

Keyboard Controller

2

-

Programmable Interrupt

3*

11

Communications Port (COM2)

4*

12

Communications Port (COM1)

5*

13

--

6

14

Floppy Disk Controller

7*

15

--

8

3

System CMOS/Real Time Clock

9*

4

ACPI Mode when used

10*

5

IRQ Holder for PCI Steering

11*

6

IRQ Holder for PCI Steering

12*

7

PS/2 Compatible Mouse Port

13

8

Numeric Data Processor

14*

9

Primary IDE Channel

15*

10

Secondary IDE Channel

* These IRQs are usually available for ISA or PCI devices.

2.5.4PCI Express x16 slots (x8 link)

The onboard PCI Express x16 slots provide one x8 link that supports VGA cards and various server class high performance add-on cards.

2.5.5PCI Express x8 slots (x4 link)

The onboard PCI-E slot 5 provide one x4 Gen3 link to CPU1. This slot supports various server class high performance add-on cards.

2.5.6PCI Express x1 slots (x1 link)

The onboard PCI Express x1 slots provide one x1 link.

2.5.7PCI slots

The PCI slot supports cards such as a LAN card, USB card, and other cards that comply with PCI 2.3 specifications.

2-18

Chapter 2: Hardware information